Pt/SrTiO3 photocatalyst for production of cycloalkanols and cycloalkanones from cycloalkanes

Patent metadata

Field	Value
Publication number	US-10894757-B2
Application number	US-201815916370-A
Country	US
Kind code	B2
Filing date	Mar 9, 2018
Priority date	Mar 9, 2018
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

Methods of preparing Pt/SrTiO3 photocatalysts comprising strontium titanate nanoparticles and platinum doped on a surface of the strontium titanate nanoparticles are described. Processes of oxidizing cycloalkanes to cycloalkanols and/or cycloalkanones by employing the Pt/SrTiO3 photocatalysts are specified. A method for recycling the photocatalyst is also provided.

First claim

The invention claimed is:

1. A process of oxidizing a cycloalkane to a cycloalkanol and/or a cycloalkanone, the process comprising:
contacting a feed mixture comprising the cycloalkane and an oxidant with a Pt/SrTiO 3 photocatalyst thereby forming a reaction mixture; and
concurrently irradiating the reaction mixture with light thereby forming the cycloalkanol and/or the cycloalkanone;
wherein the Pt/SrTiO 3 photocatalyst comprises:
strontium titanate nanoparticles; and
platinum doped on a surface of the strontium inmate nanoparticles;
wherein the platinum is present in an amount of 0.1-5.0 wt % relative to a total weight of the Pt/SrTiO 3 photocatalyst.

2. The process of claim 1 , wherein the Pt/SrTiO 3 photocatalyst has a crystallite size of 8-30 nm.

3. The process of claim 1 , wherein the Pt/SrTiO 3 photocatalyst has a BET surface area of 5-25 m 2 /g.

4. The process of claim 1 , wherein the Pt/SrTiO 3 photocatalyst has an absorption peak in a range of 360-380 nm, and a band gap energy of 2.5-3.6 eV.

5. The process of claim 1 , wherein the Pt/SrTiO 3 photocatalyst has a photoluminescence peak in a range of 380-480 nm upon excitation at a wavelength of 270-290 nm.

6. The process of claim 1 , wherein the light has a wavelength of 400-800 nm.

7. The process of claim 1 , wherein the feed mixture is contacted with the Pt/SrTiO 3 photocatalyst at a pressure of 0.5-2 atm.

8. The process of claim 1 , wherein the feed mixture is contacted with the Pt/SrTiO 3 photocatalyst at a temperature of 40-80° C.

9. The process of claim 1 , wherein the cycloalkane is present in the feed mixture at a concentration of 10-400 ppm.

10. The process of claim 1 , wherein the oxidant is present in an amount of 5-30 vol. % relative to a total volume of the feed mixture.

11. The process of claim 1 , wherein the Pt/SrTiO 3 photocatalyst is present at a concentration of 0.2-5.0 g of photocatalyst per liter of the reaction mixture.

12. The process of claim 1 , wherein the oxidant is O 2 .

13. The process of claim 1 , wherein the feed mixture further comprises an inert gas.

14. The process of claim 1 , wherein the feed mixture further comprises water.

15. The process of claim 1 , which has a molar conversion of the cycloalkane to the cycloalkanol and/or the cycloalkanone of greater than 40%.

16. The process of claim 1 , wherein the cycloalkane is cyclohexane, the cycloalkanol is cyclohexanol, and the cycloalkanone is cyclohexanone.

17. The process of claim 1 ,
wherein the platinum is present in an amount of 1.3-3.0 wt % relative to a total weight of the Pt/SrTiO 3 photocatalyst;
wherein the reaction mixture is irradiated with light for 1 to 4 hours; and
wherein the process has a molar conversion of the cycloalkane to the cycloalkanol and/or cycloalkanone of greater than 95%.

18. The process of claim 1 , further comprising:
recovering the Pt/SrTiO 3 photocatalyst after the irradiating to obtain a recovered Pt/SrTiO 3 photocatalyst; and
reusing the recovered Pt/SrTiO 3 photocatalyst, which maintains photocatalytic activity for at least 4 reaction cycles.

Assignees

• Univ King Abdulaziz

Inventors

• Salam Mohamed Abdel
• Al-Johani Hind

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title